Furnace construction



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G. L. DANFORTH, .1R 1,769,368

FURNAcE CONSTRUCTION Filed April e, 1922 Patented July 1 1930,

UNITED vifsfl'nflr.S

PATE-NT'OFFICE GEORG-E L. `DANFORTH, [R.,l OIFl CHICAGO,

ILLINOIS, AssIeNon, BY MnsNE ASSIGN- MENTS, To OPEN BEART'H CoMBUsTIoN COMPANY, or CHICAGO,l ILLINOIS, Acon- PORATION F DELAWARE I FURNCE CoNsTnUCTIoN Application inea April s,

This invention relates to a new and im' in volume the incoming air and gas, the de-v sign of the ports and passages is largely dependent upon the requirement that they be adapted to carry away the products of combustion. It is essential for proper' furnace operation that the incoming air and fuel be so directed as to properly combine to form a relatively short, hot flame. It is further necessary that this flame should be so directed as to properly .heat the bath of metal in the furnace chamber. -These two differing requirements for the design of the ports and passages have rendered it impossible toA design ports which 'are fully adapted for both purposes.

vIn the endeavor to obviate these difliculties, certain furnaces have been designed having supplemental passages for the4 car- 3o rying away of the products of combustion,

these passages having no function upon the incoming end of the furnace. Suchv a furnace is shown in the patent to McKune, N o. 1,339,855, issued Ma 11, 1920.

-In all furnaces, tered in preserving the contour of the incoming fuel port due to the fact that the products` of combustion passing through said port athigh temperature tend to erode its walls. It has ,been general' practice to insert water-cooled members in such ports, these members tending to preserve the outline. Some ports of this type are tubular in form and the entire port consists vof a tubular water-cooled member. With such ports,-

l the loss of heat on the Outgoing end due to v the coolin effect is large'and a considerable amount O water is reqired to keep the port adequately cooled. Therefore, the provision in connection with such ports, of supplefriculties are encoun4 1922. Serial No. 549,973.

mental passages for carrying olf the products of combustion or the greaterA portion thereof, is of particular importance.

It is an object of thepresent invention to provide a furnace construction in which are provided air uptakes located near the as port and airports leading from the upta es adjacent the gas port. It is a further object to provide a construction. of this. character in which supplemental passages are provided -for the prod` ucts of combustion, such passages inthe preferable form leading to the alr u takes. It is also an object toprovide a fiirnace of this :general character having a tubular fuel port, and air ports located adjacent the gas port and adapted to deliver an air stream encircling the gas stream.

combinationwith such air and gas .ports 'I0` and passages, a mixing port located betweenL l the air and gas ports and the furnace proper.

Other and further objects will appear 4as the description proceeds.-

I have illustrated a preferred embodiment of my invention in the accompanying drawin s, in which: .,f

igure 1 is a longitudinal section showing one end of afurnace constructed according to the present invention; and

Figure 2 is a horizontal section taken on line 2'-'2 of Figure 1. In the furnace as shown, the fuel uptake v(i leads from the slag pocket 7 to the, port 8. This port as shown is 'a hollowtubular member adapted to -be water-cooled by water introduced through pipe 9 and carried away through pipe 10.. The port member.r 8 is held in place'in an o enin extendi'n throughthe rear wall `l1 of) the ace an connecting the fuel uptake with the mixing port 12. This port 12 leads to the furnace I chamber 13 and is defined by piers 14. The walls of the port-adjacent the' .discharge opening are water-cooled b pipes 15.

The air uptakes 16 lead*4 rom slag pocket 17 and theirV upper ends open into air ports 17 and into supplemental passages 18 which latter lead to the furnace chamber 13.v The ports `17 as shown leadv into the combined 100 port 12 laterally of the water-cooled port 8. As :shown in -Figure 1, the ports. 17 are of greater depth than the port 8. The passages 18 are controlledl by vertically movable dampers 19 which move in water-cooled frames 20.

. In the operation of my furnace, upon the incoming end the dampers 19 are lowered to close off the passages 18. The gas fuel comes through slag pocket 7 anduptake 6 to the port 8 through which it is discharged into the combined port 12. The air comes through the slag pocket 17 and uptakes 16 and isled through ports 17 to the mixing port l2. The dampers 19 edectively block off the passages 18.

It will be observed that the air streams impinge laterally upon the gas stream and since they are of greater height than the gas stream, the gas will be completely sur.

rounded by the air stream. The reduced mixing port 12 serves tov adequately inter- I mingle the gas and air'and to properly d1- rect-'the flame upon the bath of metal in the furnace chamber 13,.

Upon the outgoing end of the furnace,

the dampers 19 are raised and the products of combustion pass out through passages 18 andthrough theport 12. The passages 18 lare greater in area than the port 12 and are also so designed as to more readily facilitate the discharge ofthe gases so that the greater portion -thereof passes through these passages. The .water-cooled port 8 is thus subjected to the flow ef only a minor portion of the gases'. The greater portion of' mas illustrative only and I reserve the right to make such modifications in. design and construction to meet varying conditions as Vcome within the scopel of the appended claims.

I claim: 'v

1. In an open hearth furnace, a gas port, air uptakes, air ports leading from said upy takes adjacent the gas port and adapted to discharge an air stream'enclosin'g the gas stream, and supplemental passages connectlg the airuptakes and the furnace chamr. 2. In an. open hearth furnace, a watercooled gas port, air uptakes, air ports leading from said uptakes adjacent the gas port, thev air ports extending below the gas port and adapted to discharge an air streamenclosing the gas stream, and supplemental passages connecting the air uptakes and the furnace chamber.

3. In an open hearth furnace, a gas port, laterally ,placed air ports opening toward the gas port, .air passages leading to said ports and supplemental passages connecting 'the air passages with the furnace chamber.

4. In an open hearth furnace, a gas port, laterally placed air ports opening toward the gas port, said air ports extending below the gas port and adapted to discharge an air stream encircling the gas stream, air pas# sages leading to said ports andsupplemental -pa-ssages connecting the air passages with the furnace chamber.

5. In an open hearth furnace, a gas port, air uptakes, air ports leading from said upvtakes adjacent the gas por't and adapted to discharge an air stream enclosingthe gas stream, supplemental passages connecting the air uptakes and the furnace chamber, andv a combined air and gas mixing port located between the air and gas ports and the furi nace chamber. n

i 6. In an openfhearth furnace, a gas port,

laterally placedair ports opening toward the gas port, said air ports extending below the gas port and adapted to discharge an air stream encircling the gas stream, vair `passages leading to said ports, supplemental` passages connecting the air passages with the furnace chamber, and a 4combined air and gas mixing port located between the air and gas ports and the furnace chamber.

7. n an open hearth furnace, a tubular, water-cooled gas port, air uptakes located laterally of the gas port, air ports leading from said uptakes adjacent the gas port, said air ports extending below the gas port and adapted to discharge a stream of air encircling the gas stream, andsupplemental passages connecting the air uptalres and the furnace chamber, and a combined air and gas mixing port located between the air and gas ports and the furnace chamber.

8. In an open hearth furnace, a gas port, air uptakes, air ports leading from said uptakes adjacent ,the gas port and adapted to discharge an air stream enclosing the gas stream, and supplemental passages connectingthe air uptakes and thel furnace chamber, said passages being providedwith means adapted to selectively interrupt flow therethrough. j

9. In an open hearth furnace, a tubular, water-cooled gas port, air uptakes located laterally of the gas port, air ports leading from said uptales adjacent the gas port and supplemental passages connecting the air uptakes and the furnace chamber, said passages being provided with dampers'adapted to selectively interrupt flow therethrough.

10.'v A metallurgical furnace comprising a April, 1922.

hearth, a combined fuel and air port at each end of the furnacer above the hearth and having a progressively constricted ort area from the end of the furnace towar the hearth with anv inclined viioor to direct .the fuel downwardly to impinge upon the metal on the hearth, and longitudinal side ilues communicating with the furnace and with the opposite sides of the respective combined fuel and air ports. l V

Signed at Chicago, Illinois, this 1st day of GEORGE L. DANFORTH, Jn. 

